i2c wav player chip
TRANSCRIPT
2
inspiration/history
Demo
4
How El-wire works
electroluminescent phosphor emits light when placed in a field of AC current.
Zinc sulfide powder, with small additions of copper or manganese
How El-wire works
How El-wire works
How El-wire works
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What does it do?
Animated el-wire portrait Driven by a home-made sequencer that animated the
el-wire Provides synchronized sound via wave file player The el-wire animation data and wave file are stored
on an SD card There can be multiple animations on a card The system will loop through the SD card directory
(fat16 file system) and play all animation file pairs it finds
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System Architecture
System
ELWire
(24 segments)
I2cseq I2c
seq
I2cseq
CPUcard
ACinverter
AMPspeaker
speaker
12v 12v6vsdcard
8 AC lines 8 AC lines
8AC
lines
I2C
I2CI2CAC
ACAC
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Hardware – el wire driver
Triac circuit
optoisolator
Hardware – el wire driver
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Hardware – daughter board
Hardware – daughter board
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Hardware – propeller chip
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Propeller cogs
Propeller Counters
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EL Wire Portrait
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Software
Big picture Talking over I2C Playing a wave file - 1 Playing a wave file - 2
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Software Big Picture
Maincog
blinkercog
elcog
wavecog
SDcog
El datacog
I2Cpins
SPIpins
audiopins
I2Clib
Filereader
lib
Wavebufferplayer
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Talking over I2C
repeat
pindir := -1
repeat 8
outa[dbgLed] := !outa[dbgLed] ' toggle the debug led
i2cObject.i2cStart
i2cObject.i2cWrite(i2cMuxAddr, numI2cMuxBits) ' send address
i2cObject.i2cWrite(pindir, numI2cMuxBits) ' send the data
i2cObject.i2cStop
waitcnt(frameTime + cnt)
pindir <-= 1
24
Playing a wave file - 1
'play the wave data from the buffer
PUB Player(pWav, buffSize, PinR, PinL) | idx, baseTime
'Set pins to output mode
DIRA[PinR]~~ 'Set Right Pin to output
DIRA[PinL]~~ 'Set Left Pin to output
'Set up this cog's counters to do D to A conversion
CTRA:= %00110 << 26 + 0<<9 + PinR
CTRB:= %00110 << 26 + 0<<9 + PinL
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Playing a wave file - 2
buffSize--
baseTime:=cnt+15000
'Play loop
repeat idx from 0 to buffSize
baseTime += 10000 ' assume this is 8k rate.
waitcnt(baseTime)
FRQA:=(byte[pWav+idx])<<24
FRQB:=FRQA ' copy same data to the other audio channel
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Creating sync data - 1
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Creating Sync data - 2
AI phoneme FV phoneme
Creating sync data – 3
Creating sync data - 4
Data file format – frame<sp>phoneme<nl>
example el data file:1 A
25 C
49 ^
73 D
97 E
Big picture again
Maincog
blinkercog
elcog
wavecog
SDcog
El datacog
I2Cpins
SPIpins
audiopins
I2Clib
Filereader
lib
Wavebufferplayer
Credits wav player - Raymond Allen
http://obex.parallax.com/objects/324/
I2C interface - James Burrows
http://obex.parallax.com/objects/217/
SPI interface to a Secure Digital card - Tomas Rokicki - http://obex.parallax.com/objects/92/
El wire hardware ideas – guerroloco member of instructables
http://www.instructables.com/id/EL-wire-eye-candy/
another el wire sequencer - Dave Chesavage - http://www.oceanbeach.com/ches/travel/burning_man/artcar/el_wire_sequencer/index.html
El wire/lipsync data file – David Cuny
http://yolo.sourceforge.net/